Precise measurements can support major improvements in medicine, defense, and research. Quantum sensors have the potential to make a wide variety of measurements with unprecedented precision. Quantum sensors are the most mature form of quantum technology, but some sensors require further improvements in reliability and cost-effectiveness. The field faces several challenges, including technology transfer obstacles, a small workforce, and a low supply of key components. Policymakers could consider how to support the technology and address concerns, such as adversaries potentially using the sensors to detect stealth technology.